package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServicelmpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
//        判断当前加入购物车的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

//        如果存在了，需要让数量加一
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }

//        如果不存在，需要插入一条购物车数据

//        判断本次添加到购物车的数据是套餐还是菜品
        Long dishId = shoppingCartDTO.getDishId();
        if (dishId != null) {
//            此次添加的数据为菜品
            Dish dish = dishMapper.getById(dishId);
            shoppingCart.setName(dish.getName());
            shoppingCart.setImage(dish.getImage());
            shoppingCart.setAmount(dish.getPrice());
        }else {
            Long setmealId = shoppingCartDTO.getSetmealId();
            Setmeal setmeal = setmealMapper.getById(setmealId);
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
        }
        shoppingCart.setNumber(1);
        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartMapper.insert(shoppingCart);
    }
    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
//        获取当前用户id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart build = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(build);
        return list;
    }
    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        //        获取当前用户id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        shoppingCartMapper.deleteByUserId(shoppingCart);
    }

    /**
     * 删除购物车的数据
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
//        属性拷贝
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        //        获取当前用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);// 设置用户ID，避免漏传

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart); // 根据 dishId/setmealId + userId 查询

        ShoppingCart cart = list.get(0); // 取出第一条记录
        if (cart.getNumber() > 1) {
            cart.setNumber(cart.getNumber() - 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            shoppingCartMapper.deleteByUserId(cart); // 删除该条购物车记录
        }

    }
}
